With the hard rock — Def Leppard’s “Gods of War,” to be specific — cranked up at top volume on a nearby sound system, longtime friends Arturo Crespin and Fidel Maldonado Jr. set their camaraderie aside.

Then they began punching each other.

It’s hardly unusual for reunions of these two to involve such violence. And this past Sunday, each of them welcomed the opportunity to slam his fists into the other and to be treated in kind.